Is it possible that the concept of time is different for intelligent aliens to that of ours ?, when we look for signs of alien radio communications should we look for a range of modulations that are well away from ours or are there physical restraints that would make them similar.

The range of differences between rates of time dilation only become significant near large dense masses. For "normal range" dilation it would hardly be a consideration. Unless the sender was travelling at relativistic speed.

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